People receiving buprenorphine-naloxone (bup-nx) for opioid use disorder often face changes in cravings, withdrawal, and return to use risk between clinic visits, but their care team may not know about these changes until the person misses an appointment or returns to drug use. Measurement-based care (MBC) uses brief, repeated check-ins from patients to make these between-visit changes visible. This study tests "Bup-MBC," a strategy that sends patients short questionnaires through their patient portal or by text before and between visits, gives them immediate supportive feedback, shares summary information with their prescriber in the electronic health record, and offers an option to request earlier contact if concerns arise. The study will include providers and patients at outpatient addiction clinics at Vanderbilt University Medical Center, randomly assigned to either receive Bup-MBC or usual care, and followed for 6 months. The main goal is to determine whether Bup-MBC can be practically delivered in routine addiction clinics and whether patients and providers use it.